2 files changed, 142 insertions, 0 deletions
diff --git a/apps/files/lib/Collaboration/Resources/Listener.php b/apps/files/lib/Collaboration/Resources/Listener.php
new file mode 100644
index 00000000000..e4ff5d83b7a
--- /dev/null
+++ b/apps/files/lib/Collaboration/Resources/Listener.php
@@ -0,0 +1,33 @@
+<?php
+
+declare(strict_types=1);
+
+/**
+ * SPDX-FileCopyrightText: 2019 Nextcloud GmbH and Nextcloud contributors
+ * SPDX-License-Identifier: AGPL-3.0-or-later
+ */
+namespace OCA\Files\Collaboration\Resources;
+
+use OCP\Collaboration\Resources\IManager;
+use OCP\EventDispatcher\IEventDispatcher;
+use OCP\Server;
+use OCP\Share\Events\ShareCreatedEvent;
+use OCP\Share\Events\ShareDeletedEvent;
+use OCP\Share\Events\ShareDeletedFromSelfEvent;
+
+class Listener {
+	public static function register(IEventDispatcher $dispatcher): void {
+		$dispatcher->addListener(ShareCreatedEvent::class, [self::class, 'shareModification']);
+		$dispatcher->addListener(ShareDeletedEvent::class, [self::class, 'shareModification']);
+		$dispatcher->addListener(ShareDeletedFromSelfEvent::class, [self::class, 'shareModification']);
+	}
+
+	public static function shareModification(): void {
+		/** @var IManager $resourceManager */
+		$resourceManager = Server::get(IManager::class);
+		/** @var ResourceProvider $resourceProvider */
+		$resourceProvider = Server::get(ResourceProvider::class);
+
+		$resourceManager->invalidateAccessCacheForProvider($resourceProvider);
+	}
+}
diff --git a/apps/files/lib/Collaboration/Resources/ResourceProvider.php b/apps/files/lib/Collaboration/Resources/ResourceProvider.php
new file mode 100644
index 00000000000..73883bc4c6a
--- /dev/null
+++ b/apps/files/lib/Collaboration/Resources/ResourceProvider.php
@@ -0,0 +1,109 @@
+<?php
+
+declare(strict_types=1);
+
+/**
+ * SPDX-FileCopyrightText: 2018 Nextcloud GmbH and Nextcloud contributors
+ * SPDX-License-Identifier: AGPL-3.0-or-later
+ */
+namespace OCA\Files\Collaboration\Resources;
+
+use OCP\Collaboration\Resources\IProvider;
+use OCP\Collaboration\Resources\IResource;
+use OCP\Collaboration\Resources\ResourceException;
+use OCP\Files\IRootFolder;
+use OCP\Files\Node;
+use OCP\IPreview;
+use OCP\IURLGenerator;
+use OCP\IUser;
+
+class ResourceProvider implements IProvider {
+	public const RESOURCE_TYPE = 'file';
+
+	/** @var array */
+	protected $nodes = [];
+
+	public function __construct(
+		protected IRootFolder $rootFolder,
+		private IPreview $preview,
+		private IURLGenerator $urlGenerator,
+	) {
+	}
+
+	private function getNode(IResource $resource): ?Node {
+		if (isset($this->nodes[(int)$resource->getId()])) {
+			return $this->nodes[(int)$resource->getId()];
+		}
+		$node = $this->rootFolder->getFirstNodeById((int)$resource->getId());
+		if ($node) {
+			$this->nodes[(int)$resource->getId()] = $node;
+			return $this->nodes[(int)$resource->getId()];
+		}
+		return null;
+	}
+
+	/**
+	 * @param IResource $resource
+	 * @return array
+	 * @since 16.0.0
+	 */
+	public function getResourceRichObject(IResource $resource): array {
+		if (isset($this->nodes[(int)$resource->getId()])) {
+			$node = $this->nodes[(int)$resource->getId()]->getPath();
+		} else {
+			$node = $this->getNode($resource);
+		}
+
+		if ($node instanceof Node) {
+			$link = $this->urlGenerator->linkToRouteAbsolute(
+				'files.viewcontroller.showFile',
+				['fileid' => $resource->getId()]
+			);
+			return [
+				'type' => 'file',
+				'id' => $resource->getId(),
+				'name' => $node->getName(),
+				'path' => $node->getInternalPath(),
+				'link' => $link,
+				'mimetype' => $node->getMimetype(),
+				'preview-available' => $this->preview->isAvailable($node),
+			];
+		}
+
+		throw new ResourceException('File not found');
+	}
+
+	/**
+	 * Can a user/guest access the collection
+	 *
+	 * @param IResource $resource
+	 * @param IUser $user
+	 * @return bool
+	 * @since 16.0.0
+	 */
+	public function canAccessResource(IResource $resource, ?IUser $user = null): bool {
+		if (!$user instanceof IUser) {
+			return false;
+		}
+
+		$userFolder = $this->rootFolder->getUserFolder($user->getUID());
+		$node = $userFolder->getById((int)$resource->getId());
+
+		if ($node) {
+			$this->nodes[(int)$resource->getId()] = $node;
+			return true;
+		}
+
+		return false;
+	}
+
+	/**
+	 * Get the resource type of the provider
+	 *
+	 * @return string
+	 * @since 16.0.0
+	 */
+	public function getType(): string {
+		return self::RESOURCE_TYPE;
+	}
+}